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Date: Sun, 27 Nov 2011 17:57:58 +0100
From: Christian Gmeiner <christian.gmeiner@...il.com>
To: linux-kernel@...r.kernel.org
Cc: rpurdie@...ys.net,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: Re: [PATCH] add led driver for Bachmann's ot200
Any feedback on this? Would like to get the driver in 3.3
--
Christian Gmeiner, MSc
2011/11/18 Christian Gmeiner <christian.gmeiner@...il.com>:
> From a7fecf3426ef98fdd19e9d2610665b9d1ce358a0 Mon Sep 17 00:00:00 2001
> From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> Date: Fri, 18 Nov 2011 10:21:48 +0100
> Subject: [PATCH] add led driver for Bachmann's ot200
>
> This patch adds support for leds on Bachmann's ot200 visualisation device.
> The device has three leds on the back panel (led_err, led_init and led_run)
> and can handle up to seven leds on the front panel.
>
> The driver was written by Linutronix on behalf of
> Bachmann electronic GmbH.
>
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> Signed-off-by: Christian Gmeiner <christian.gmeiner@...il.com>
> ---
> drivers/leds/Kconfig | 8 ++
> drivers/leds/Makefile | 1 +
> drivers/leds/leds-ot200.c | 204 +++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 213 insertions(+), 0 deletions(-)
> create mode 100644 drivers/leds/leds-ot200.c
>
> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> index ff203a4..6cf0dd6 100644
> --- a/drivers/leds/Kconfig
> +++ b/drivers/leds/Kconfig
> @@ -387,6 +387,14 @@ config LEDS_RENESAS_TPU
> pin function. The latter to support brightness control.
> Brightness control is supported but hardware blinking is not.
>
> +config LEDS_OT200
> + tristate "LED support for Bachmann OT200"
> + depends on LEDS_CLASS
> + help
> + This option enables support for the LEDs on the Bachmann OT200. The
> + LEDs are controlled through LPC bus.
> + Say Y to enable LEDs on the Bachmann OT200.
> +
> config LEDS_TRIGGERS
> bool "LED Trigger support"
> depends on LEDS_CLASS
> diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
> index e4f6bf5..0814d42 100644
> --- a/drivers/leds/Makefile
> +++ b/drivers/leds/Makefile
> @@ -43,6 +43,7 @@ obj-$(CONFIG_LEDS_NS2) += leds-ns2.o
> obj-$(CONFIG_LEDS_NETXBIG) += leds-netxbig.o
> obj-$(CONFIG_LEDS_ASIC3) += leds-asic3.o
> obj-$(CONFIG_LEDS_RENESAS_TPU) += leds-renesas-tpu.o
> +obj-$(CONFIG_LEDS_OT200) += leds-ot200.o
>
> # LED SPI Drivers
> obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o
> diff --git a/drivers/leds/leds-ot200.c b/drivers/leds/leds-ot200.c
> new file mode 100644
> index 0000000..60f118b
> --- /dev/null
> +++ b/drivers/leds/leds-ot200.c
> @@ -0,0 +1,204 @@
> +/*
> + * Bachmann ot200 leds driver.
> + *
> + * Author: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> + * License: GPL as published by the FSF.
> + */
> +
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +#include <linux/leds.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +
> +struct ot200_led {
> + struct led_classdev cdev;
> + char name[8];
> + unsigned int num;
> +};
> +
> +static u8 old_val;
> +static u8 old_val_back;
> +DEFINE_SPINLOCK(value_lock);
> +
> +static void ot200_led_set(struct led_classdev *led_cdev,
> + enum led_brightness value)
> +{
> + struct ot200_led *led = container_of(led_cdev, struct ot200_led, cdev);
> + u8 val;
> + u8 mask;
> + unsigned long flags;
> +
> + mask = 1 << led->num;
> +
> + spin_lock_irqsave(&value_lock, flags);
> + val = old_val;
> +
> + if (value == LED_OFF)
> + val &= ~mask;
> + else
> + val |= mask;
> +
> + old_val = val;
> + spin_unlock_irqrestore(&value_lock, flags);
> + outb(val, 0x49);
> +}
> +
> +static void ot200_led_back_set(struct led_classdev *led_cdev,
> + enum led_brightness value)
> +{
> + struct ot200_led *led = container_of(led_cdev, struct ot200_led, cdev);
> + u8 val;
> + u8 mask;
> + unsigned long flags;
> +
> + mask = 1 << led->num;
> +
> + spin_lock_irqsave(&value_lock, flags);
> + val = old_val_back;
> +
> + if (value == LED_OFF)
> + val &= ~mask;
> + else
> + val |= mask;
> +
> + old_val_back = val;
> + spin_unlock_irqrestore(&value_lock, flags);
> + outb(val, 0x5a);
> +}
> +
> +static int __devinit create_ot200_led(struct platform_device *pdev, int num,
> + struct ot200_led *led)
> +{
> + int ret;
> +
> + num += 1;
> + snprintf(led->name, sizeof(led->name), "led%d", num);
> + led->num = 7 - num;
> + led->cdev.name = led->name;
> + led->cdev.default_trigger = NULL;
> + led->cdev.blink_set = NULL;
> + led->cdev.brightness_set = ot200_led_set;
> +
> + ret = led_classdev_register(&pdev->dev, &led->cdev);
> + if (ret < 0)
> + goto out;
> +
> + dev_set_drvdata(led->cdev.dev, led);
> + return 0;
> +
> + led_classdev_unregister(&led->cdev);
> +out:
> + return ret;
> +}
> +
> +static int __devinit create_ot200_led_back(struct platform_device *pdev,
> + int num, struct ot200_led *led)
> +{
> + char *led_name;
> + int ret;
> +
> + switch (num) {
> + case 0:
> + led_name = "run";
> + break;
> + case 1:
> + led_name = "init";
> + break;
> + case 2:
> + led_name = "err";
> + break;
> + default:
> + BUG();
> + };
> +
> + snprintf(led->name, sizeof(led->name), "led_%s", led_name);
> + led->num = num;
> + led->cdev.name = led->name;
> + led->cdev.blink_set = NULL;
> + led->cdev.brightness_set = ot200_led_back_set;
> +
> + ret = led_classdev_register(&pdev->dev, &led->cdev);
> + if (ret < 0)
> + goto out;
> +
> + dev_set_drvdata(led->cdev.dev, led);
> + return 0;
> +
> + led_classdev_unregister(&led->cdev);
> +out:
> + return ret;
> +
> +}
> +
> +#define NUM_LEDS 7
> +#define NUM_LEDS_BACK 3
> +#define NUM_LEDS_TOTAL (NUM_LEDS + NUM_LEDS_BACK)
> +
> +static int __devinit ot200_led_probe(struct platform_device *pdev)
> +{
> + struct ot200_led *leds;
> + int i;
> + int ret;
> +
> + leds = kzalloc(sizeof(struct ot200_led) * NUM_LEDS_TOTAL, GFP_KERNEL);
> + if (!leds)
> + return -ENOMEM;
> +
> + for (i = 0; i < NUM_LEDS; i++) {
> + ret = create_ot200_led(pdev, i, &leds[i]);
> + if (ret < 0)
> + goto err;
> + }
> +
> + for (i = NUM_LEDS; i < NUM_LEDS + NUM_LEDS_BACK; i++) {
> + ret = create_ot200_led_back(pdev, i - NUM_LEDS, &leds[i]);
> + if (ret < 0)
> + goto err;
> + }
> +
> + platform_set_drvdata(pdev, leds);
> + outb(0x0, 0x49); /* turn of all front leds */
> + outb(0x2, 0x5a); /* turn on init led */
> + return 0;
> +
> +err:
> + for (i = i - 1; i >= 0; i--)
> + led_classdev_unregister(&leds[i].cdev);
> +
> + kfree(leds);
> +
> + return ret;
> +}
> +
> +static int __devexit ot200_led_remove(struct platform_device *pdev)
> +{
> + int i;
> + struct ot200_led *leds;
> +
> + leds = platform_get_drvdata(pdev);
> +
> + for (i = 0; i < NUM_LEDS_TOTAL; i++)
> + led_classdev_unregister(&leds[i].cdev);
> +
> + kfree(leds);
> + platform_set_drvdata(pdev, NULL);
> +
> + return 0;
> +}
> +
> +static struct platform_driver ot200_led_driver = {
> + .probe = ot200_led_probe,
> + .remove = __devexit_p(ot200_led_remove),
> + .driver = {
> + .name = "leds-ot200",
> + .owner = THIS_MODULE,
> + },
> +};
> +
> +module_platform_driver(ot200_led_driver);
> +
> +MODULE_AUTHOR("Sebastian A. Siewior <bigeasy@...utronix.de>");
> +MODULE_DESCRIPTION("ot200 LED driver");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:leds-ot200");
> --
> 1.7.5.4
>
--
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